Checking over the fleet of new-for-2013 snowmobiles leaves us with as many questions as answers. We believed that Arctic Cat would continue to develop its new ProCross models and make them better as engineers solved some typical early Year One issues. Frankly we expected more from Ski-Doo, but the company's MXZ models hold a healthy lead in the big bump trail market. Polaris continues to be popular with both trail and off-trail ridership. That leaves Yamaha, whose only really new product for 2013 was its kiddie sled, the SRX 120 and a nicely updated Nytro XTX off-trail sport model.